straight talk Wireless prepaid phones at Walmart

I was thinking about getting a straight talk Wireless prepaid phone at Walmart so I started reading the TERMS AND CONDITIONS OF SERVICE and it says The Straight Talk Unlimited Plans MAY NOT be used for any other purpose. Examples of prohibited uses include, without limitation, the following: (i) continuous mobile to mobile or mobile to landline voice calls. What I want to know is can I call a landline phone if I don't call them to often also is it still unlimited if I call another cell phone provider? here is the link to the STRAIGHT TALK WIRELESS TERMS AND CONDITIONS OF SERVICE. Go all the way down the till you see Find us on face book the TERMS AND CONDITIONS is up above it.